Stof
Stof is an AI-powered Development tool — Safe, sandboxed execution of untrusted JSON‑based logic via WebAssembly. Best for: Development. Pricing: Free (GateOnAI Score: 67/100).
Safe, sandboxed execution of untrusted JSON‑based logic via WebAssembly
Stof lets your app run AI‑generated logic safely by embedding functions directly in a JSON document. The document holds both data and the functions that operate on it, and your application executes it in a sandboxed, in‑process environment using Rust, JavaScript, or Python. Any valid JSON is already a Stof document, and you can add types and functions where needed, then export back to JSON, YAML, or TOML. Stof supports merging documents, extracting objects with their functions, diffing versions, and storing or transmitting them as compact binary. It requires no separate server or container, and a VS Code extension provides editor features like errors, go‑to‑definition, and completion.
Summary written from Stof's own website on 17 Oct 2026. Check the vendor's website for current details.
How to evaluate Stof before you buy
What GateOnAI has on record
- Pricing model: Listed as free to use
- GDPR: No statement recorded on GateOnAI - ask the vendor
- EU data hosting: Not recorded on GateOnAI - ask the vendor
- Website check: Online at our check on 3 Nov 2026
Questions to ask the vendor
- Will you sign a GDPR data processing agreement (Article 28) and share your list of sub-processors?
- Where is our data stored and processed, and is it used to train your models?
- Are there usage limits on the free version, and could it become paid?
- Can we export all our data, and how is it deleted when we cancel?
- (Development) Is our code used to train models, and can we opt out?
- (Development) Who owns the generated code, and do you offer protection against licence or copyright claims?
Full checklist: 43 questions to ask an AI vendor · Alternatives to Stof · Compare Stof with Cursor
More Development Tools
- 2kw.ai - A unified OpenAI-compatible gateway for LLMs, document extraction, transcription, and AI agents.
- ABMeter - Run A/B experiments effortlessly through your AI assistant with ABMeter SDKs.
- APIThreshold - Quality scoring and progressive gates for AI-generated API tests
- AWS Bedrock - AWS managed AI foundation models service
- AWS CodeWhisperer - Amazon's AI coding companion for cloud development
- AWS Comprehend - AWS AI natural language processing service
May Connect With
Tools whose input/output tags match those of Stof (the tags are assigned automatically and the connections are not tested):